harry potter gave me back self-respect. harry gave me a job to do that i love more than anything else. if i had made just enough to justify to continue to write, it would have cheered me up a great amount. it's not that cavalier a thing to say. >> reporter: what's your reward? you've finished the book. you're going to go on the tour. >> which will be lots of fun. but i'm looking forward to getting home because we're getting a new dog. my reward is getting home and look after a new puppy. >> she is completely charming. after five, long years, how does the new book start? tomorrow, you'll find out right here, as j.k. rowling opens up and reads the first passage for us. she asked me, only a half-dozen, a dozen readers in the world, what i thought about the book and whether or not i cried at the end. we'll show you that, too. >> you can see more of cynthia's interview on "world news" and later on "nightline." and check out the newsmakers interview at goodmorningamerica.com. >>> i love saying this. two-time emmy winner, julie bo